| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that the number of parts is increased because a metal conductor conventionally has to be fixed to an antenna conductor for electrical matching. SOLUTION: This antenna device has a cylindrical dielectric annular support stand 2 long in one direction, the antenna conductor 1 which is arranged on the surface in the length direction of the dielectric annular support stand and where the shape of its conductor part coincides with the shape of its non-conductor part when turned around the center axis of the antenna at 90 degrees, antenna conductors 1a and 1b which are arranged on the top plate of the dielectric annular support stand and where the shapes of their conductor parts coincide with the shapes of their non-conductor parts when turned around the center axis of the antenna at 90 degrees, and a slit whose length is 1/4 wavelength, and is provided with a split balun 3 for performing balanced-to-unbalanced transformation. Then, the antenna device is excellent in electrical matching and can obtain desired radiation characteristics with any antenna diameter.
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